“It is with great pleasure that I present the Global Industry Standard on Tailings Management, which sets a precedent for the safe management of tailings facilities, towards the goal of zero harm.
“The catastrophic dam collapse at Vale’s Corrego de Feijao mine in Brumadinho was a human and environmental tragedy that demanded decisive and appropriate action to enhance the safety and strengthen the governance of tailings facilities across the globe. I am particularly pleased to deliver a document that reflects and addresses the complexity and multi-disciplinary nature of sound tailings management.
Dr Bruno Oberle, Chair: Global Tailings Review
Check full size picture ofGISTM-Summary
According to "Global Industry Standard on Tailings Management", it is emphasized that extreme consequences to people and the environment from catastrophic tailings facility failures are unacceptable. It means operators must show zero tolerance for human fatalities and do their utmost to reduce harm to people and the environment from the earliest phases of project conception. Now, it is widely agreed that DST (Dry Stack Tailings) is the most sustainable way for eliminating risks while enabling the mining industry to continue at the same time (even in water-scarce areas).
Dry stacking is a method of dewatering the tailings stream so that most of the liquid components are removed, to form the cake-like accumulation. This method eliminates the risk of liquefaction, greatly reduces the volume of tailings, and recovers process water.
As the ore grades decline, the revenue per tonne will decrease accordingly, and so operators have to find a way to decrease the cost of tailings processing to make the operation economically viable and solution cost-competitive with alternate technologies.
With the upgrade of technology, the GHT-F filter press developed by Diemme Filtration is suitable for large-volume applications of tailing dewatering, which will be delivered in 2021 to the South American market. It can dehydrate more than 25.000 mtpd of materials and uses an electric moving head to open the folding filter plate package within one minute. The filter cake can be eliminated and the output per unit area of the filter can be increased.
To achieve such high filtration volume, GHT-F was available in two filter plate sizes, 1500x1500mm, and 2500x2500mm. But for even-larger throughputs in future tailings applications, Diemme Filtration will roll out GHT5000F, which will be equipped with a 5000x5000 mm filter plate to provide a more than 3,000 m2 of filtration area to exceed capacities of 12,000 mtpd of solids throughput making it the largest in the World. For such large plates to reduce the amount of weight and steel utilized, the finite elemental analysis was done over the entire structure.
Furthermore, the GHT series will also be equipped with an integrated high-pressure cloth washing system. The on-board cloth washing system uses 50 bar of water pressure to clean the filter cloth, to reduce the changing times of filter cloth, reduce downtime of the machine, reduce maintenance costs and extend the lifetime of the filter cloth. In order to easily and safely replace the filter cloth, it is designed to be hanged on the top of the filter plate so that it can be taken out of the filter press. Additionally, there are no detachable or installed snaps, zippers, ties, or other tightening solid hardware.
The first unit will be delivered in 2021 to an Operator in South America for tailings dewatering.
The body of the filter plate is manufactured by injection molding and consequently, a new plate mold had to be created. Therefore, it is also a challenge for filter cloth.
The market for filters is extremely varied and subject to continuous changes. As traditional production can not meet the increasing need for the market, many operators decided to develop a new manufacturing system and choose laser cutting technology.
Laser cutters can machine very large formats by means of seamless cutting transition.
To optimize the capital and operation of the costs of plant operating, many companies came up with laser cutting filter cloth, which requires less than half the manufacturing time when compared with traditional measures like a knife cutting machine. Employing a laser to cut filter cloth can shorten turnaround time while maintaining the same high standard of quality. Laser cutting technology is certified as the 'state-of-the-art' cutting by more and more cooperation.
Mimowork understands your need and is dedicated to offering customers the latest, energy-saving laser cutting system, aiming at the flexible production and optimum use of material place.
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